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Leak Detection Pump - Mazda6 (2.3L)

WARNING: This page is about a different car, the 2003 Mazda Protege5, 2003 Mazda Protege, 2003 Mazda MX-5 Miata, 2003 Mazda MPV, and 2003 Mazda 6. However, it is still accessible from the selected car via links, so may be relevant.

  1. Air Flow Inspection

    Locate leak detection pump. See Figure. Disconnect hoses from leak detection pump. Blow air into port "A" (charcoal canister side). Air should flow from port "B". See Fig 1. If air does not flow from port "B" (air filter side), replace EVAP system leak detection pump. Blow air into port "B". Air should flow from port "A". If air does not flow from port "A", replace EVAP system leak detection pump. If EVAP system leak detection pump is as specified, go to next step.
    Fig 1: Identifying EVAP System Leak Detection Pump Ports
    G00110232Courtesy of MAZDA MOTORS CORP.

  2. Resistance Inspection

    Disconnect negative battery cable. Disconnect EVAP system leak detection pump 4-pin harness connector. See Fig 2. Using DVOM, check resistance between appropriate terminals on EVAP system leak detection pump. See EVAP SYSTEM LEAK DETECTION PUMP RESISTANCE SPECIFICATIONS (Mazda6)  table. If resistance readings are within specification, check for open or short circuit. Go to next step. If resistance readings are not as specified, replace EVAP system leak detection pump.
    Fig 2: Identifying EVAP System Leak Detection Pump Connector Terminals
    G00110233Courtesy of MAZDA MOTORS CORP.

  3. Open Circuit Inspection

    Disconnect PCM harness connectors. Check continuity between following:
    • EVAP system leak detection pump 4-pin harness connector terminal "A" and main relay 4-pin harness connector terminal "D" (White wire). See Fig 3.
    • EVAP system leak detection pump 4-pin harness connector terminal "B" (Black wire) and ground.
    • EVAP system leak detection pump 4-pin harness connector terminal "C" and PCM 30-pin harness connector terminal No. 3V (Orange wire).
    • EVAP system leak detection pump 4-pin harness connector terminal "D" and PCM 30-pin harness connector terminal No. 3Y (Pink wire).

    If continuity is present, go to next step. If continuity is not present, repair open circuit in suspect wire or replace wire harness. See appropriate WIRING DIAGRAM under ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS.

    Fig 3: Identifying EVAP System Leak Detection Pump Harness Connector Terminals (Terminal View)
    G00110234Courtesy of MAZDA MOTORS CORP.

  4. Short Circuit Inspection

    Check for continuity between following:
    • EVAP system leak detection pump 4-pin harness connector terminal "A" (White wire) and ground.
    • EVAP system leak detection pump 4-pin harness connector terminal "B" (Black wire) and power.
    • EVAP system leak detection pump 4-pin harness connector terminal "C" (Orange wire) and power.
    • EVAP system leak detection pump 4-pin harness connector terminal "D" (Pink wire) and power.

    If continuity is present, repair short circuit in suspect wire or replace wire harness.

EVAP SYSTEM LEAK DETECTION PUMP RESISTANCE SPECIFICATIONS (MAZDA6)

Terminals Resistance (ohms)
A-B 20-50
A-C 26.6-32.4
A-D Maximum 118
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